High pressure rotary pump unit



March 24,1959 J. MARCO U 2,878,751

HIGH PRESSURE ROTARY PUMP UNIT IN VEN TOR.

March 24, 1959 J. MARCQ Y 2,878,757

HIGH PRESSURE ROTARY PUMP UNIT L Filed Aug. 16, 1954 3 Sheets-Sheet 2 IN V EN TOR.

WW Aff@ EVS March 24, 1959 J. MARCO 2,878,757

, HIGH PRESSURE ROTARY PUMP UNIT Filed Aug. 16, 1954 3 Sheets-Sheet 'o' United States Patent C 2,878,757 i HIGH PRESSURE ROTARY PUMP UNIT John Marco, Earlville, Md. Application August 16, 195.4', Serial No. 449,914 Claims. (Cl. 10B-+202).-

This invention relatesf to pumping equipment and more particularly to one of' the rotary type intended to be 'employedfor high pressure dut Rotary pumpsof the conventional type are usually employed for work at relatively low pressure, when they are of the single stage type. However, they maybe used for high pressure duty if they are const'fnicted on a multistage arrangement, Where the pressure is increased in value by augmenting the pressures ofy each stage in'series, until the final pressure attained is of the t'otal required. By utilizing the pump of, this invention, pressures of the order of over a 1000 lbs. per square inch may be obtained in a single stage. To accomplish this the` type of pump described in United States Patent Number 2,321',- 609 is employed and driven through the use of a suitable motor. However, in addition to the features'referred to and included in this patent, which is the invention of the applicant herein, the structure is improved by theuse of an automatic seal that is designed' to ride on thehub which is an integral part of the rotors, vand in vsuch a manner as to substantially eliminate the sealv wear on the shafts. The pump rotor is arranged with a balancing plug that is connected with the rotor and serves to automatically balance the hydraulic stresses in the device. This will be more fully appreciated as they invention is more fully outlined.

An object of the invention is to provide a newy and improved rotary pressure pump that avoids some of the objections and limitations of previous types in this` class.

Another object of the invention is to provide a new and improved rotary pressure pump that will be hydraulically balanced.

A further object of the invention is to provide a new and improved rotary pressure pump that will be sealed hydraulically to substantially eliminate*wear.y

An additional object oftheinventionk is to provide a new and improved rotary pressure pump including means to prevent the fluid material or product handled thereby from entering the spline sections.

A still further object of this invention. is to provide a new and improved pressurev pump designed"I to facilitate cleaning and the maintenancey of sanitary conditions;

Still another object of the' invention lis to provide a new and improved pressure pump designed to reduce shaft corrosion, abrasion andA wear to a minimum.

Another object of this invention is to provide a new and improved pressure pump that` can be operated under increased tolerance' yet avoid material seepage of the product in designatedlportions of the pump where such would bey injurious or undesirable.

Further objects and advantagesofthe invention will be apparent from the following description, taken'A in conjunction with the accompanying drawings, wherein:

Fig. l isy a. longitudinal section through a rotarypressure pump embodying this, invention; l

Fig. 2, a plan view partly in sectionof Fig; 1,;

Fig. 3, an elevational view looking into the pump structure where the rotors are attached'to their shafts;

Fig. 4, a similar view with the cover and header plates removed and the sealing plugs. disclosedthe rotorsil not being shown;

Fig. 5, a modied form of sealing plug.

Similar parts throughout the drawings are. designated by the same reference numerals.

In the construction shownin Fig, 1^, thegeneral, structure is that of a high pressure rotary pump 1,. such. as illustrated in United States Patent No` 2,321,609, and intended primarily for high pressure duty involvedy dur;- ingy theprocessing of uid material into a homogenized product in the homogenizer. 2. The studs 3 secure-v the cover plate 4. in place, which is pressed against'. thefiiat header plate 5, and other. plates as shown. Thev header plate 5 is primarily intended to form a close` fitting; abutment against which a pair of meshing rotors 6 and; 7, respectively, can engage their forward faces. The. plate 5 is provided interiorlyy with circular recesses' 60- and 70 respectively in which the` sealing plugsf 61 and 71V rotate in. the rotor housing 11 in front of the rotatable;y shafts. 8 and 9. The sealing plugs are externally/screw threaded onv one side so they willA screw. tightly into therotors. This is. facilitated by the square heads 62 and 72 on the opposite. sides. and the enlarged circular flanges- 63- and 73 extending out around the p1ugs,61l and71f respectively. rlhese plugs'being sealed in, in.y the header platesv by the closed-in structure of the recesses 60 and 70 serve to prevent seepage of the material. being pumped or. homogenized in the device. The recessesy 60v and. 70,; with theplugs 61 and 71, andthe shafts S-and 9-respectively, are axially aligned with eachother.

The rotor 6 is mounted on the driving shaft-8 and meshes its radially projectingblades 66l withthe similar blades77 of the driven rotor 7, so theywill be cooperativelypropelled, aswell as serving to process and'` eject the uid material used in the pump. Therrotorsf` and y 7 fit closely against the wall surfaces of the rotor charnber Sand'through grooves andring slots formed therein produce the necessary high pressure in the material pumped, as already described in the patent' citedabove.

These grooves and slots are not illustrated in the accompanying drawings. Various parts ofthe device having the same reference numerals inV the patent cited as those in this application and having the samefunctons, are included'in the following description:

The housing for the rotor is marked 11 An automatic compensatorl control Wear plate is shown at 12, between the header plate 5 and the front seal plate 13 A companion seal plate 14 is securedA betweenj the plate 13 and the gasket plate 8K1, next to the flange 84" of vthe pump shaft housing 15, and is providedA with themetal armor liners 17 in the bevelled bores 16 and chambers 16. They cooperate with the annular seal glandslS, to sealol'r the, hubs of the rotors and'thereby prevent leakage. Gasket rings 82 are inserted in annular recesses 83 in the stung box plate 81 about the shafts S'and 9`to prevent leakage and in place of the type of gaskets indicated, for the same purpose, directly in the housing. 1 5 in the previous patent already mentioned. The radially projecting keys 84 are used with the shafts 8 and 9 to operably secure the rotors 6 and 7 in preferencev to the arrangement previously illustrated. Double sets of roller bearings 24'support the shafts 8 and 9 in the housing 15, which.; is interiorly enlarged for the purpose. The sleeves 85 retain the bearings 24 in place andare themselves held against them byy the collars 86, integraly with the shafts 8 and 9, as shown in Fig. 1. The shafts 8 and9 project from the housing 15 into a bearing and gear housing 25, wherethey have auxiliary gears 2,3fkeyed and mounted on them and meshing with oney another.. The shaft' 9'terminates in the housing 25 and inside the'roller 3 bearing 24 arranged for it. Another similar bearing 24 supports the drive shaft 8, which does not terminate like the shaft 9, but continues through to couple to a motor extraneous to the pumpstructure, and is provided with a stuing box 88 to prevent leakage. An end plate 26 is bolted on the gear housing 25 to retain the roller bearings 24 in place and aligned. The housing 25 is bolted in place on to the housing and also has an annular passage or water jacket 68 through it for cooling water to circulate.

The housing 15 is provided with an oil sump 28 and a drain connection 29 to remove the accumulations. A partition Z7 runs through the housing 15 and is suitably slanted to facilitate the draining of the housings 15 and 25 to the sump 28. The outlet plugs 69, provide access to the water jacket 68. The inlet and outlet to the homogenizer are respectively shown at 35 and 36.

In the form shown in Figure 1, the sealing plugs 61 and 71 are screwed into the rotors and block the latter while riding with it, while at the same time covering the ends of the shafts 8 and 9 and the splines or keys 84 in them, so that leakage is prevented along the shafts. The anges 63 and 73 accentuate this prevention. The recesses 60 and 70 take the place of the bores previously employed. The hubs 64 and 74 on the rotors 6 and 7 respectively, extend laterally from the rotors within holes provided therefor in the plates 12, 13 and 14 and at the inner portions run in peripheral contact with the liners 16 and glands 18. A space is left between the hub faces and the gasket plate 81 as shown. A groove 87 is left in each hub, at the corner left between each plate and its hub portion. The collars 86 on the shafts, between the sleeves 85 and the gears 24 are items not previously disclosed and serve as balancing means to damp deflections and reduce shaft breakage due to concentrated localized fatigue causing excessive shear stresses.

In the modified form shown in Fig. 5, the sealing plug 171 is of somewhat different form and is termed an automatic sealing plug. It provides greater running tolerance than` the form above described. It comprises a ring-like shell 174 and at 176 is exteriorly screwthreaded to thread into the rotor 7, and has peripheral sockets 172 for the insertion of a tool to operate it, instead of the nut heads 72 previously indicated.' Its tiange 173 extends over and partly fits into a recess or counterbore 177, in the rotor face. The sealing plug 171 contains centrally within it, a frictionally held element 180 which is movably inserted in the circular shell 174 concentrically surrounding it and provided with a peripheral groove 178 receiving a gasket ring 179 to make it tight. The shaft 9 is preferably reduced in diameter as shown in Figure 5 with the splines 84 brought to the normal diameter of the shaft. The faces 65 and 75 of the rotors are irnpressed by similar pressures and enable the rotors to revolve properly balanced. The pressure on the exterior face of the plug 171 forces the element 180 against the free end face of the shaft 9. The shell 174 of the plug is secured to the rotor 7 by the screwthreads 176 and with its shoulder 173 seals off the screwthreaded sections. The gasket ring 179 prevents leakage by the element 180 and by the splines and key ways.

The invention is of particular importance, since it affords better service from a pump capable of performing high pressure duties. High pressure in any pump creates special problems. The fluids handled under high pressure tend to create excessive wear, particularly where such'fluids contain abrasive or corrosive substances. Any leakage or seepage of such fluids results in the same becoming lodged within the key-ways and splines thereby causing excessive wear at these points. The sealing means of this invention substantially eliminates these undesirable features. The sealing plugs obstruct leakage by the ends of the revolving shafts and do it in a simple their use, maintenance and assembly. They do not involve any appreciable additional cost or add to the size of the unit. It prevents the contamination of the product and its becoming involved in the mechanism of the device.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof, and therefore the invention is not limited by that which is shown in the drawingand described in the specification, but only as indicated in the appended claims.

What is claimed is:

1. For use in a high pressure pump of the rotary` type, a rotor shaft, a rotor having a bore extending" therethrough and removably received on said shaft, a portion of said rotor projecting beyond the end of said shaft and having a at end face on the outer end thereof perpendicular to the axis of said shaft, key ways in said shaft and said rotor, a key in saidkey ways to prevent relative rotationbetwecn said shaft and said rotor, an

enlarged threaded recess in the outer end of said bore, a sealing plug threadedly received in said recess and an annular flange on said plug engaging said end face to prevent leakage of uid into said bore and between said 'and effective manner. They are easily replaceable and afforda certain amount of adjustability that facilitates shaft and said rotor.

2. For use in a high pressure pump of the rotary type, a rotor shaft, a rotor having a bore extending therethrough and removably received on said shaft, a portion of said rotor projecting beyond the end of said shaft and having a flat end face on the outer end thereof perpendicular to the axis of said shaft, means to prevent relative rotation between said shaft and said rotor, an enlarged threaded recess in the outer end of said bore, a sealing plug threadedly received in said recess and an annular flange on said plug engaging said end face to prevent leakage of fluid into said bore and between said shaft and said rotor.

3.y For use in a high pressure pump of the rotary type, a rotor shaft, a rotor having a bore extending therethrough and removably received on said shaft, a portion of said rotor projecting beyond the end of said shaft and having a at end face on the outer end thereof perpendicular to the axis of said shaft, means to prevent relative rotation between said shaft and said rotor, threads in the outer end of said bore, a sealing plug threadedly received in said bore and an annular flange on said plug engaging said end face to prevent leakage of liuid into said bore and between said shaft and said rotor.

4. For use in a high pressure pump of the rotary type, a rotor shaft, a rotor having a bore extending therethrough and removably received on said shaft, a portion of said rotor projecting beyond the end of said shaft and having an end face on the outer end thereof perpendicular to the axis of said shaft, means to prevent relative `rotation between said shaft and said rotor, threads in the outer ends of said bore, a sealing plug threadedly received in said bore and an annular flange on said plug engaging said end face to prevent leakage of uid into said bore and between said shaft and said rotor.

5. A structure as` defined in claim 4 in which said plug is provided with means for automatically compensating for a variation in pressure tending to cause leakage between said rotor and said shaft and to vary the sealing effect in accordance with such'change in pressure.

(Other references on following page) 5 UNITED STATES PATENTS Funk Apr. 7, 1942 Hembach Jan. 16, 1945 Wallgren Sept. 17, 1946 Moineau Sept. 27, 1949 Collura Apr. 7, 1953 Dale et al. Apr. 21, 1953 Thomas June 23, 1953 6 Fielding Dec. 8, 1953 Thomson et al. Mar. 23, 1954 Iedrziewski Mar. 22, 1955 Gehres May 15, 1956 Pehrsson et a1. June 4, 1957 Strandell July 9, 1957 FOREIGN PATENTS Great Britain 1901 

